Open this photo in gallery:NASA's Mars rover, Perseverence, March, 2020. It appeared the U.S. space agency would be the first to bring anything back from Mars. But that mission was delayed multiple times and finally scrapped this January, clearing the decks for China.SuppliedSave for laterAround the start of the next decade, a piece of another world will be brought to Earth, studied, experimented upon, gawked at and, it’s hoped, found to contain life. No, not the moon. Luna is dead, always has been. But Mars may have once been alive ? may still be. Signs of potential life have been…